Coach Pete Carroll told Liz Mathews of 710 ESPN that Sidney Rice is in Switzerland receiving treatment on his knee. Carroll did not provide any specifics, but with the absence of Percy Harvin (hip), Rice’s apparent knee issue is disconcerting.

Carroll said that Rice is not expected to miss any preseason games and he hoped the treatment he receives would give him “fresh legs.”

A number of American athletes in a number of sports have gone to Europe for Regenokine injection treatments. The procedure has not been approved the FDA, but athletes contend the procedure is beneficial. It involves removing blood from the body, separating it to create a protein-rich serum designed to accelerate healing to injured areas of the body after the blood is re-injected.

Rice played the latter part of the 2012 season with knee pain, but was never sidelined.

Harvin, meanwhile, has gotten a second opinion on his hip from New York-based doctor, Dr. Bryan Kelly. He now must choose a treatment option, which may involve surgery.

Carroll told the Tacoma News Tribune that surgery wouldn’t necessarily mean the end of Harvin’s season.